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2 years ago

75% of students is blank of 20 students

Mathematics

2 answers:

Ivan2 years ago

8 0

Answer: 15

Explanation: multiply 20 by .75

Ronch [10]2 years ago

7 0

Answer:

Step-by-step explanation:

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Fish food is $3.50. An aquarium is $10.00. A filter system costs $9.95. Gravel and plants are $6.25. Mike has $30.00 to spend. H

Veronika [31]

Add all the prices together:

3.50 + 10.00 + 9.95 + 6.25 = 29.70

He has 30, so he had 30 - 29.70 = 0.30 left over for fish.

The two fish cost 4.50 + 4.50 = 9.00

He would need 9.00 - 0.30 = $8.70 more money

3 0

3 years ago

6b^3 (2a+7b), how to solve it?

slamgirl [31]

6b^3 (2a+7b)


(6b^3)(2a+7b)


=(6b^3)(2a)+(6b^3)(7b)


=12ab^3+42b^4]

Answer: 
12ab^3+42b^4

6 0

3 years ago

Find r if 0=pi/6 rad sector 64m^2

kap26 [50]

Given:

Area of a sector = 64 m²

The central angle is $\theta=\dfrac{\pi}{6}$ .

To find:

The radius or the value of r.

Solution:

Area of a sector is:

$A=\dfrac{1}{2}r^2\theta$

Where, r is the radius of the circle and $\theta$ is the central angle of the sector in radian.

Putting $A=64,\theta=\dfrac{\pi}{6}$ , we get

$64=\dfrac{1}{2}r^2\times \dfrac{\pi}{6}$

$64=\dfrac{\pi}{12}r^2$

$64\times \dfrac{12}{\pi}=r^2$

$\dfrac{768}{\pi}=r^2$

Taking square root on both sides, we get

$\sqrt{\dfrac{768}{\pi}}=r$

$16\sqrt{\dfrac{3}{\pi}}=r$

Therefore, the value of r is $16\sqrt{\dfrac{3}{\pi}}$ m.

6 0

3 years ago

A hiker is climbing down a valley. He stops for a water break 4 times. Between each break, he descends 15 meters. How many meter

Murljashka [212]

The word in the problem that indicates that a negative sign should be used is "descend"

<h3></h3><h3>How many meters did he descend?</h3>

We know that he stops for water breaks four times, and between each water break, he descends 15 meters.

The written equation is:

4*(-15)m = -60m

Why the negative sign is used?

The negative sign is used because the hiker is descending, so its height is decreasing. The word in the problem that indicates that a negative sign should be used is "descend"

If you want to learn more about signs:

brainly.com/question/5870782

#SPJ1

7 0

2 years ago

Enter the values for m, n, and p that complete the difference:

inessss [21]

Answer:

p = 2

n = 14

m = 3

Step-by-step explanation:

In order to be able combine (either add or subtract) rational expressions we need to write them with a common (similar) denominator. For that reason we first find the Least Common Denominator of both fractions, that way understanding how to express the two fractions using equivalent fractions with like denominator that can be combined.

We see that the denominator of the first fraction contains the factor "x", therefore "x" has to be a factor of that least common denominator.

We also see that the second fraction contains "2" as a factor, therefore 2 has to be a factor as well for our Least Common Denominator (LCD)

So the LCD we need is the product: 2*x which we write as 2x.

Now we write the first fraction as an equivalent one but with denominator "2x" by multiplying top and bottom by 2 (and thus not changing the actual value of the fraction): $\frac{7}{x} =\frac{7*2}{x*2} =\frac{14}{2x}$

Next we do the same with the second fraction, this time multiplying top and bottom by the factor "x":

$\frac{3}{2} =\frac{3x}{2x}$

Now that both fractions are written showing the same denominator , we can combine them as indicated:

$\frac{7}{x} -\frac{3}{2} =\frac{14}{2x} -\frac{3x}{2x} =\frac{14-3x}{2x}$

This expression gives as then the values for the requested coefficients.

p = 2

n = 14

m = 3

5 0

3 years ago

Read 2 more answers